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Measuring LiPo on Adafruit nRF52 Feather


Tomas McGuinness <tomas@...>
 

Hello,

I'm quite new to Zephyr, and I have a question related to the nRF52 Adafruit Feather.

As I understand it, this board gives you the ability to measure the voltage on the connected LiPo battery using GPIO 31 (A7). 

For a small sensor project, I would like to use this measurement to report on battery level, but I cannot find any guidance on how I might read this pin's value? 

Are there any examples you would recommend I take a look at? Any help would be very much appreciated!

Regards,
Tom


Peter A. Bigot
 

Look at samples/boards/nrf/battery, and boards/arm/thingy52_nrf52832/thingy52_nrf52832.dts which adds the voltage-divider compatible that describes the circuit connected to the ADC input.  You'll need a similar node with the resistances specific to your board.

Peter